Inverter self-test circuit applied to microgrid and power-on self-test method thereof
A self-checking circuit and inverter technology, applied in the field of inverters, can solve problems such as consuming a lot of manpower and material resources, low efficiency, and increasing use costs, so as to reduce the work of inspectors, improve work reliability, and avoid equipment damage. Effect
Active Publication Date: 2016-08-03
JIANGSU FANGCHENG ELECTRIC SCI & TECHCO +1
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Problems solved by technology
[0002] The inverter bridge in the inverter is generally composed of multiple IGBTs, and the IGBT is a vulnerable device that is easily damaged due to overcurrent or overvoltage without timely protection; at the same time, the internal current and voltage of the inverter are controlled by The voltage, current and other signals collected by the inverter controller, if there is an error in signal collection, it will easily cause overvoltage or overcurrent in the inverter; in addition, if there is a wiring error or device failure inside the inverter, It is also easy to cause damage to the IGBT if it is started rashly;
[0003] Therefore, in order to ensure the reliability of the inverter, the usual practice is: the manufacturer sends professional technicians to use oscilloscopes and other professional instruments to manually test the inverter on site; It consumes a lot of manpower and material resources, which greatly increases the cost of the enterprise
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[0042] see Figure 1~5 , the present invention relates to an inverter self-inspection circuit applied to a microgrid, the inverter includes a three-phase inverter bridge composed of six IGBTs (Q1~Q6), and the three-phase inverter bridge A DC support capacitor C0 is connected between the positive and negative poles of the DC side, and the positive pole of the DC support capacitor C0 is connected to the positive pole of the switching power supply PW1 through the normally open contact K1-1 of the DC on-off control relay K1, and the negative pole of the DC support capacitor C0 is connected to the positive pole of the switching power supply PW1 through The normally open contact K1-2 of the DC on-off control relay K1 is connected to the negative pole of the switching power supply PW1, and the AC side of the three-phase inverter bridge is connected to the contactor KM1 through the LCL filter circuit, and the contactor KM1 is connected to the three-phase alternating current;
[0043]...
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The present invention relates to an inverter self-test circuit applied to a microgrid and a power-on self-test method thereof. The inverter comprises a three-phase inverter bridge formed by six IGBTs. A direct current support capacitor C0 is connected between the positive and negative electrodes of the three-phase inverter bridge; the positive electrode of the direct current support capacitor C0 is connected with the positive electrode of a switch power supply PW1 through the normally open contact K1-1 of a direct current on-off control relay K1, and the negative electrode of the direct current support capacitor C0 is connected with the negative electrode of the switch power supply PW1 through the normally open contact K1-2 of a direct current on-off control relay K1; and the alternating current side of the three-phase inverter bridge is connected with a contactor KM1 through a LCL filtering loop, and the contactor KM1 is connected with three-phase alternating current. According to the invention, the inverter self-test circuit applied to microgrid and the power-on self-test method thereof are high in test efficiency, and rapid and convenient.
Description
technical field [0001] The invention relates to a self-inspection circuit of an inverter and a method for self-inspection at startup thereof, in particular to an inverter self-inspection circuit applied to a microgrid, and belongs to the technical field of inverters. Background technique [0002] The inverter bridge in the inverter is generally composed of multiple IGBTs, and the IGBT is a vulnerable device that is easily damaged due to overcurrent or overvoltage without timely protection; at the same time, the internal current and voltage of the inverter are controlled by The voltage, current and other signals collected by the inverter controller, if there is an error in signal collection, it will easily cause overvoltage or overcurrent in the inverter; in addition, if there is a wiring error or device failure inside the inverter, It is also easy to cause damage to the IGBT if it is started rashly; [0003] Therefore, in order to ensure the reliability of the inverter, the...
Claims
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Login to View More IPC IPC(8): G01R31/42
CPCG01R31/42
Inventor 张建兴张之豪胡秋立
Owner JIANGSU FANGCHENG ELECTRIC SCI & TECHCO